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Long-Term Debt (Narrative) (Detail) - USD ($) | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2017 | Apr. 20, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |
Long term debt |  | $ 3,971,890,000 |  | $ 3,632,692,000 |  |
Debt issuance costs |  | 633,000 |  |  |  |
Cash and cash equivalents |  | 268,469,000 |  | 154,382,000 | $ 9,263,000 | $ 10,974,000
Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long term debt | [1] | $ 636,915,000 |  | 310,582,000 |  |
Credit Agreement [Member] | Minimum [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | [1] | 2.02% |  |  |  |
Credit Agreement [Member] | Maximum [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | [1] | 4.25% |  |  |  |
Tax-exempt Bonds [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long term debt | [1] | $ 95,430,000 |  | 95,430,000 |  |
Tax-exempt Bonds [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | [1] | 0.90% |  |  |  |
Tax-exempt Bonds [Member] | Maximum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | [1] | 0.96% |  |  |  |
Notes Payable to Sellers and Other Third Parties [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long term debt | [1] | $ 27,045,000 |  | 14,180,000 |  |
Notes Payable to Sellers and Other Third Parties [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | [1] | 2.00% |  |  |  |
Notes Payable to Sellers and Other Third Parties [Member] | Maximum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | [1] | 24.81% |  |  |  |
Senior Notes [Member] | Subsequent Event [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount |  |  | $ 400,000,000 |  |  |
Senior Notes [Member] | Senior Notes due 2018 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long term debt |  | $ 50,000,000 |  | $ 50,000,000 |  |
Interest rate |  | 4.00% |  | 4.00% |  |
Senior Notes [Member] | Senior Notes due 2019 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long term debt |  | $ 175,000,000 |  | $ 175,000,000 |  |
Interest rate |  | 5.25% |  | 5.25% |  |
Senior Notes [Member] | Senior Notes due 2021 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long term debt |  | $ 100,000,000 |  | $ 100,000,000 |  |
Interest rate |  | 4.64% |  | 4.64% |  |
Senior Notes [Member] | New Senior Notes due 2021 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long term debt |  | $ 150,000,000 |  | $ 150,000,000 |  |
Interest rate |  | 2.39% |  | 2.39% |  |
Senior Notes [Member] | Senior Notes due 2022 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long term debt |  | $ 125,000,000 |  | $ 125,000,000 |  |
Interest rate |  | 3.09% |  | 3.09% |  |
Senior Notes [Member] | Senior Notes due 2023 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long term debt |  | $ 200,000,000 |  | $ 200,000,000 |  |
Interest rate |  | 2.75% |  | 2.75% |  |
Senior Notes [Member] | Senior Notes due 2025 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long term debt |  | $ 375,000,000 |  | $ 375,000,000 |  |
Interest rate |  | 3.41% |  | 3.41% |  |
Senior Notes [Member] | Senior Notes due 2026 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long term debt |  | $ 400,000,000 |  | $ 400,000,000 |  |
Interest rate |  | 3.03% |  | 3.03% |  |
Term Loan Facility [Member] | Credit Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long term debt | [1] | $ 1,637,500,000 |  | $ 1,637,500,000 |  |
Interest rate | [1] | 2.18% |  |  |  |
Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Liabilities incurred |  | $ 56,957,000 |  |  |  |
Base Rate [Member] | Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility outstanding |  | $ 3,000,000 |  |  |  |
Interest rate applicable |  | 4.25% |  |  |  |
LIBOR [Member] | Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility outstanding |  | $ 350,600,000 |  |  |  |
Interest rate applicable |  | 2.02% |  |  |  |
LIBOR [Member] | Credit Agreement [Member] | Term Loan Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long term debt |  | $ 1,637,500,000 |  | $ 1,637,500,000 |  |
Interest rate |  | 2.18% |  | 1.97% |  |
Canadian Prime Rate [Member] | Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility outstanding |  | $ 11,345,000 |  | $ 7,448,000 |  |
Interest rate applicable |  | 2.95% |  | 2.95% |  |
Canadian Bankers Acceptance Loan [Member] | Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility outstanding |  | $ 271,970,000 |  | $ 303,134,000 |  |
Interest rate applicable |  | 2.11% |  | 2.13% |  |
[1] | Interest rates represent the interest rates incurred at March 31, 2017

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